I just got the Riedell 435s. Prior to that, I had the old Riedell Bronze Stars, the 320s. I am a petite adult. My old boots lasted 9 years. When I got the 320s, I had no break-in period at all. Loved them. The new Bronze Stars (the 435s) are SIGNIFICANTLY stiffer, more like the old Gold Stars. I had no problem with the boot itself, but the tongue is unbelievably stiff. If I ever need new boots again, I will have a different tongue put in, or have it softened first. Riedell was great - I emailed them about how miserable I was with the tongues, and they said I could mail them back and have them softened. I ended up just working through the pain, but I have permanent dents in my shins now from the tongues. It took 4 weeks before I could skate without taking ibuprofen before, and icing my shins before/after I skated.
My boot dealer told me I would not like the 910s (but didn't give a reason why). He also offered the 255s to me but recommended I go with the 435s.
Good luck deciding, and SO sorry your car was stolen!